attack americans. about 28,000 u.s. military personnel are stationed in neighboring south korea. 38,000 are in japan. and now kim jong un's forces are threatening to wipe those bases off the map. our own tom foreman is standing by in our virtual studio. tom, just how serious is this threat? >> well, i tell you, jake, a lot more serious than what he said a couple weeks ago the idea he'd lob a missile over to the united states some 5,000 miles away. all the analysts say they don't have the technology to make that happen right now. but this idea of hitting americans in the pacific area, much more plausible. look at this. from pyongyang to japan, about 800 miles. as you mentioned, thousands and thousands of troops there. army, navy, air force, marines. all of them represented in japan. it's about 2,000 miles down to guam down here. only about 5700 troops down there. but, boy, is this an attractive target, one of the most important bomber bases on the planet for the united states, jake. >> what would the north koreans use to deliver such attacks?